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Assets Held for Sale - Additional Information (Detail)
$ in Thousands
Aug. 31, 2015
USD ($)
a
Jul. 29, 2015
USD ($)
May. 31, 2015
USD ($)
Long Lived Assets Held-for-sale [Line Items]      
Land held for sale     $ 5,207
Purchase land planned to construct future facilities in area | a 50    
Sales price of sold property   $ 5,300  
Land [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Land held for sale $ 5,200